Takt time
The pace a line has to run at to meet demand, which decides whether assembly work is quoted as bench build or as a station with parts presented.
Takt time is customer demand expressed as a rhythm. Divide the available production time by the units required and you get the interval each unit has to be completed in for the schedule to hold.
For quoting purposes it matters because it decides the method. An assembly built one at a time on a bench by a skilled fitter costs differently from the same assembly built at a station with components presented in order, and the crossover between them is a volume question rather than a preference.
Getting this wrong in either direction is expensive. Quote the bench method at a volume that needs a line and the labour figure is optimistic and the delivery is at risk. Quote a line at a volume that does not need one and the setup cost prices you out.
Takt also constrains the routing. If a single operation takes longer than the takt interval it becomes the bottleneck regardless of how fast everything else runs, which is a capacity conversation the estimator should raise before the quote rather than after the award.